Optical fiber specklegram sensor analysis by speckle pattern division

Author(s)

Fujiwara, Eric ; Marques dos Santos, Murilo Ferreira ; Suzuki, Carlos Kenichi

• Document type: Journal article
• Source: APPLIED OPTICS; v. 56, n. 6, p. 6-pg., 2017-02-20.

Abstract

An optical fiber specklegram sensor interrogation method based on speckle pattern fragmentation is presented. The acquired specklegram images are divided in a square grid, creating sub-images that are further processed by a correlation technique, allowing the quantification of localized changes in the specklegrams. The methodology was tested on the assessment of linear displacements using a microbending transducer, by evaluating different grid sizes. For a 5 x 5 grid, a 2.53 mm(-1) sensitivity over a 0.27 mm range was obtained, representing an extension of 237.5% in comparison to the standard interrogation technique. Therefore, the presented technique allows enhancing the sensor dynamic range without modifying the experimental setup. (C) 2017 Optical Society of America (AU)

• FAPESP's process: 14/25080-0 - Development of an optical fiber based tactile sensor system for applications in mechatronics
• Grantee: Eric Fujiwara
• Support Opportunities: Regular Research Grants